BCXC-SVX01A-EN
43
Maintenance Procedures
Perform the following maintenance
procedures to ensure proper unit
operation.
WARNING
Hazardous Voltage!
Before servicing unit disconnect all
electrical power including remote
disconnects. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing can cause death or serious
injury.
Air Filters
Always install filters with directional
arrows pointing toward the fan.
Fan Bearings
Fan bearings are permanently sealed
and lubricated and do not require
additional lubrication.
Fan Motors
Inspect fan motors periodically for
excessive vibration or temperature.
Operating conditions will vary the
frequency of inspection and lubrication.
Motor lubrication instructions are on the
motor tag or nameplate. If for some
reason these instructions are not
available, contact the motor
manufacturer. Some motor
manufacturers may not provide oil tubes
on motors with permanently sealed
bearings.
Before lubricating the motor:
1. Turn the motor off and disconnect
power to the unit to ensure themotor
doesn’t accidentally start.
2. Use a No. 10 SAE, non-detergent
automotive type oil. Do not over-oil.
Sheave Alignment
To prevent interference of the fan frame
with the belt, make sure that the belt
edge closes to the motor has the proper
clearnce from the fan frame as shown in
Figure M-MP-1.
Align the fan and motor sheaves by using
a straight–edge or taut string, as shown in
Figure M-MP-2. The straight-edge must
be long enought to span the distance
between the sheave outside edges.
Maintenance
Maintenance
Procedures
Figure M-MP-2. Correct sheave alignment.
Table M-MP-1. Recommended Torques for Tightening Sheaves and Bearing Thrust Collar
Torque
In-lbs
Ft-lbs
N-m
Sheave Setscrew
144
12
16.3
Bearing Thrust Collar
66
5.5
7.5
Fan Wheel Setscrew
144
12
16.3
Be careful not to over-tension fan belt.
Excessive tension will reduce fan and
motor bearing life, accelerate belt wear
and possibly cause shaft failure. Clean
the sheaves and belt with a dry cloth.
Keep oil and grease away from the belt
because they may cause belt
deterioration and slippage. Trane does
not recommend belt dressing.
CAUTION
Belt tension!
Do not over-tension belts. Excessive
belt tension will reduce fan and motor
bearing life, accelerate belt wear, and
possibly cause shaft failure.
Coil Maintenance
When the sheaves are aligned, the
straigt–edge will touch both sheaves at
points A through D, as shown in Figure
M-MP-5 on page 44. For uneven width
sheaves, place a string in the center
groove of both sheaves and pull tight.
Adjust sheaves and tighten the sheave
set screws to the correct torques recom-
mended in Table M-MP-1.
Fan Assembly Set Screws
Check and adjust fan wheel, bearing, and
sheave set screws whenever a
compnent is removed r an adjustment is
made. Refer to Table M-MP-1 for
recommendations.
Fan Belt Tension
Proper belt tension is necessary to
endure maximum bearing and drive
component life and is based on fan brake
horsepower requirements. Replace belt
when frayed or worn.
Fan belt tension should only be tight
enough so the belt does not slip and
maintains adequate airflow.
Note: Check fan belt tension at least
twice during the first days of new belt
operation since there is a rapid decrease
in tension until belts are run-in.
Figure M-MP-1. Clearance recommendation
to prevent fan frame and belt interface.
